JPH02122224A - Color consecutively measuring device - Google Patents

Abstract

PURPOSE:To eliminate limit in designing an optical system and to attain spectrometry with high accuracy by respectively guiding the light of multiwavelength from a sample body which is dispersed by a diffraction grating to a photodetector by an image guide. CONSTITUTION:A sheet-like object 1 is successively moved in a y-direction. The part to be measured 1a of the object 1 is irradiated with light from a light source and the reflected light from the object 1 is condensed by an image- formation lens 2 and made incident on a spectrum part 3. The light condensed by the lens 2 is extracted in a belt shape by a slit 4 and made incident on the diffraction grating 5. The light receiving surface of the grating 5 is formed to be concave and the spectrum of the incident light is performed in a wavelength direction shown by an arrow lambda every wavelength. The spectral light of every wavelength is made incident on a plate-like fiber bundle optical system 6. the light of every wavelength which is made incident on the optical system 6 is guided to a photodiode array 8 by the image guide 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a color continuous measurement device, particularly for measuring the color of a sample object that changes or moves continuously or instantaneously. This invention relates to a device for determining continuous color Δ1.

[Conventional technology] Cloth, paper, and iron IQ, like the old days! - An example of a device for determining the surface color of objects continuously produced in the form of 11 is a continuous surface color inspection device described in Japanese Patent Application Laid-open No. 54-IC1786. This device irradiates white light in a linear manner and measures the intensity of the reflected light using a spectroscopic two-dimensional imaging device to determine the chromaticity at each position of the linear light. It is something.

As another example, Japanese Patent Application Laid-Open No. 113-1983 discloses that a set of at least 3 flAI sensors is arranged in a straight line, and a color sensor is used in f:, i, 17, and inspection patterns. There is a system in which the inspection light is split into spectra using a prism and made incident on a color sensor individually to inspect the pattern.

[Problem to be solved by the invention] The surface color continuous inspection device described in the above-mentioned Japanese Patent Application Laid-Open No. 54-0786 is a one-dimensional imaging system consisting of a CCD or the like as a light receiving element. When a two-dimensional image sensor is used for UI, the dynamic range of the raw material is as low as about two digits.
It is not possible to perform highly accurate measurements. On the other hand, PDA (
A one-dimensional imaging device using a photodiode array (photodiode array) can have a dynamic range of more than 4 orders of magnitude, and has a high viscosity dll+ constant that can be turned into an i+5 function.
The disadvantage is that it is large in size and imposes restrictions when designing the optical system.

Furthermore, when a prism is used as the spectroscopic section j', as in the apparatus described in Japanese Unexamined Patent Publication No. 60-11-9'37, the spectral resolution becomes low. Also,
Regarding color sensors, it is currently impossible to make accurate measurements because it is currently impossible to manually create a color sensor with performance that closely matches the current sensitivity. In addition, if a diffraction grating is used as a spectroscopic element, the spectral resolution will be high, but if you try to analyze the visible range at once, the spectral wavelength interval will not be uniform due to the nonlinearity of the optical system, and the spectral resolution will increase. Since the imaging surface is a curved surface, there is a drawback that linearity decreases as the distance from the center of the image increases.

Furthermore, if a -dimensional or two-dimensional solid-state photodetector such as a CCD, PCD (plasma coupled device), or PDA is used, crosstalk between adjacent cells may occur.
There was a problem in that the resolution of each element was low due to this.

Therefore, the main purpose of this invention is to install an optical system.
It is an object of the present invention to provide a color continuous A+1 determination device that can perform spectroscopic measurements with high precision and continuously determine colors by eliminating the limitations of .

[Means for Solving the Problems] The present invention is a continuous color measuring device that determines the color of a sample object that changes or moves continuously or instantaneously, and uses light from a sample object at multiple wavelengths. It consists of a diffraction grating that simultaneously disperses the light of several wavelengths, and a bundle of many optical fibers. , and a light-receiving element that is provided corresponding to the other end of each of the many optical fibers constituting the image guide and converts the guided light of each wavelength into an electrical signal.

[A'1 The color continuous A1 measuring device according to this invention has a j
- Since the multi-wavelength light from the dispersed sample object is guided to the light receiving element by the image guide,
By using a PDA as a light receiving element, restrictions on optical system design can be eliminated and highly accurate spectroscopic measurements can be performed.

[Embodiment of the Invention] Fig. 1 is a diagram showing the configuration of an embodiment of the invention, Fig. 2 is a perspective view schematically showing a spectroscopic unit, an image guide, and a PDA, and Fig. 3 is a diagram showing a configuration of an embodiment of the invention. FIG. 4 is an external perspective view of the fiber fixing device; FIG. 5 is a diagram showing the mounting structure of the optical fiber and PDA; and FIG. 6 is a plate-shaped FIG. 2 is a side view showing a fiber bundle optical system, a fiber fixture, and an optical fiber.

First, the configuration of an optical system according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6.

As shown in FIG. 1, the sea I-shaped object 1 sequentially moves in the y direction. Light is irradiated from a light source (not shown) to the fixed area 1a of the sheet-like object 1, and the reflected light is focused by the imaging lens 2 and sent to the spectroscopic unit 3. The spectroscopic section 3 includes a slit 4, a diffraction grating 5, and a plate-like fiber optic system 6. The light condensed by the condenser lens 2 is extracted into a band shape by the slit 4 and is incident on the diffraction grating 5. The diffraction grating 5 has a concave light-receiving surface, and separates the incident light into wavelengths for each wavelength in the wavelength direction indicated by the arrow λ. This spectrum is, for example, 380 nm to 7
Light with a wavelength of 20n ITI is applied every wavelength of 1 [Llnm. The separated light of each wavelength is incident on the plate fiber bundle optical system 6. This plate-like fiber bundle optical system 6 is spec I
- An image formed by the light separated for each wavelength is projected onto the plate fiber bundle optical system 6. This plate-like fiber bundle optical system 6 is constructed by bundling optical fibers and having a concave light-receiving surface. The light of each wavelength incident on the plate-shaped fiber bundle optical system 6 is guided to the PDA 8 by the image camera door.

The image guide 7 is formed by bundling 625 quartz optical fibers 71 with a diameter of 40 μm, for example, and as shown in FIG. 3, one end has a circular shape with a diameter l ITI ITI and the other end has a cross section of 3 9mm x 02
It has a tri-shape. And 7, light fur r
One end of the huff 1 is connected to a fiber fixture 72 as shown in FIG.
is fixed to the plate-shaped fiber bundle optical system 6 by.

That is, holes are formed in the fiber fixture 72 for inserting 35 optical fibers in the vertical direction and 16 optical fibers in the horizontal direction. In addition, the other end of the tip end 1 is attached to the mounting bracket 9.
Therefore, it is removed by PDA 8 (-1 is removed).

P I) A 8 is, for example, an array consisting of 1 to 15 elements r, or an array of 16 elements, each of which corresponds to the other end of the tip fiber 7. Take (-1 metal fittings 9
It also has the function of closing late so that the light from the optical fa/r huff does not leak into the adjacent area and harm people.

FIG. 7 is a block diagram showing the electrical configuration of an embodiment of the present invention. In FIG. 7, each array 81 of the PDA 8
, 82...8n outputs are the driver 101, 102...
]0[1j is added to l, amplified and multiplexed.
I got 7-J on 11th. Multibrekli.

11 sequentially selects the respective outputs of the arrays 81, 82-8n amplified by the drivers 101 102-1On, and the outputs of the selected arrays are A/
The D converter 12 converts it into a digital signal and outputs it. The data converted into dental signals is manually processed by a microcomputer (not shown).

By constructing the color continuous measuring device as described above, we can obtain
・J light is condensed by condensing L/lens and passes through slit 4
The light is incident on the diffraction grating 5 through the diffraction grating Ji5, and is separated in the wavelength h'' direction by the diffraction grating Ji5, and the light of each wavelength is incident on the plate fiber bundle optical system 6.The light of each wavelength is r
Guided to PDA8 by Mejiga r door, PDA8
Each array 81. 82-8 output of n or tra-rha 1
01,102.]On. Then, -r
, l · lime 1 (11, 1 + 111 (respective outputs of 1n are selected by multiplexer 1), and A/
1] Converter] 2 converts the signal into a digital signal and outputs it as a digital signal.

Figure 8 shows spectrum 11 in the wavelength direction! It is a figure for explaining the distortion of i image.

As shown in FIG. 8, when the light from the entrance slit 4 is separated by the diffraction grating 5 and a non-curved surface 8 is placed on the Rowland circle 51 of the diffraction grating 5, In all cases, the dispersion is linear with respect to the wavelength, but the wavelength spacing becomes wider toward the edge of the light-receiving surface. In contrast, in one embodiment of the present invention, the light of each wavelength separated by the diffraction grating 5 is imaged on the plate fiber bundle optical system 6, and each imaged image is Since the light is guided to the PDA 8 by the image guide 7, a special effect is achieved in that distortion in the wavelength direction can be reduced compared to the example shown in FIG.

[Effects of the Invention] As described above, according to the present invention, light from a sample object is dispersed into multi-wavelength light at the same time in the wavelength direction and in the spatial direction, and an image guide consisting of a bundle of many optical fibers is produced. By, timestJi)? Since the multi-wavelength light dispersed by the five lenses was made to be absorbed into the photodetector's stomach, it was possible to detect the angle of each position lined up in a straight line on the surface of a sheet-like object such as cloth, paper, or steel plate. 1 spectrum simultaneously and continuously with good viscosity Δ1
It is possible to set

4. Explanation of the Drawings FIG. 1 is a diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a perspective view showing the image guide and the PDA. Figure 3 shows 47. Figure 5 shows the optical fiber and PD.
FIG. 6 is a side view showing a plate-like fiber bundle optical system, a fiber optic, and an optical fiber. FIG. 7 is a diagram showing an embodiment of the present invention. FIG. 8 is a diagram for explaining the distortion of the spectrum i; l: ig in the wavelength b direction.

In the diagram, 1 is Sea! - shaped object, 2 is a condensing lens, 3
is a spectroscopic section, 4 is a slit, 5 is a rotor, 6 is a plate-like fiber bundle optical system, 7 is an image guide, 8 is a PI) A, 9 is a metal fitting,] 1 is a multiplexer, 12 is a A/D converter, 7] is an optical fiber, 7]02 is a fiber handle, 81°82 = -8n is a PDA.

102° 102... ], On indicates Dora/Rha.

Claims (1)

[Scope of Claims] A continuous color measuring device for measuring the color of a sample object that changes or moves continuously or instantaneously, comprising a diffraction grating that simultaneously disperses light from the sample object into light of multiple wavelengths; an image guide consisting of a bundle of optical fibers, which receives multi-wavelength light dispersed by the diffraction grating at one end and guides it to the other end; A color continuous measuring device, comprising a correspondingly provided light receiving element that converts the guided light of each wavelength into an electrical signal.